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January 24 – Original Adema vocalist Mark Chavez leaves the band for the second time. ; January 29 – Britney Spears' s Hold It Against Me debuted at # 1 on US Billboard Hot 100, making Spears the second artist to have more than one single to debut at no. 1, behind Mariah Carey. She also being the third female artist, behind Cher, Madonna and Janet Jackson to top the Hot 100 in.